rust-lang / rust-lang/rustfmt

Poor formatting of chain with 2 calls

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A-call-chains I-poor-formatting P-low
Dominant language
Rust
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Description

Running rustfmt changes the following, and I think the original formatting is better:

-        let section = section
-            .fde(Endian::Big, &cie1_location, &mut fde1)
-            .fde(Endian::Big, &cie2_location, &mut fde2);
+        let section = section.fde(Endian::Big, &cie1_location, &mut fde1).fde(
+            Endian::Big,
+            &cie2_location,
+            &mut fde2,
+        ); 

If there's 3 fde calls then it is okay.

Tested with:

  • 0.3.8-nightly (346238f 2018-02-04)
  • 0.4.2-nightly (1415a4d 2018-04-14)

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Research direction

Start by reproducing the reported two-call fde chain with the listed rustfmt nightly versions, then compare it with a chain containing three calls. Trace the formatter behavior responsible for the different layouts; done means the two-call chain uses the preferred multiline formatting without regressing the three-call case.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
tooling
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
42/100

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